This is the simplest and most effective way to keep the radiation away from your head. A wired headset keeps the antenna far away from your skull, allowing you to use your phone without worrying that you might be cooking your brain. A Bluetooth wireless headset will also reduce your exposure somewhat, but you'll still be absorbing some radiation. Most decent earbuds that you'd use to listen to your iPhone or other music-playing handset will also include a microphone for speaking.
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A new government-funded study found that cell phone radiation can cause measurable changes in brain activity. Whether those changes are good, bad, cancerous or none of the above is unknown, but it doesn’t hurt to reduce your exposure — just to be safe. The good news is that there are simple ways to do so, and they don’t include going back to the paper cup-and-string method of telecommunication.